You’re probably already familiar with simple SQL queries, such as “SELECT * FROM table”. Now you are wondering what to do when you have multiple tables and you want to join them. Exactly! JOIN is the key. In this tutorial, you will learn how to connect data from multiple tables using SQL JOINs. What are SQL JOINs? Databases usually have more than one table. JOINs are an SQL construction used to join data from two or more tables.